Grinding-mill.



M. E. ROZELLE.

GRINDING MILL. APPLICATION FILED APR. s, 1909. RENBWBD DB0. 15, 1911.

Patented July 3o, 1912.

2 SHEETS-SHEET l.

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Wilko/mes,

M. E. ROZELLB. l

GRINDINQ MILL. APPLIOATION FILED AHL?, 1909. RENEWED DBO. 15, 1911. 1,084,034'. Patented, July 3o, 1912.

2 SHEETS-SHEET 2.

Aiiuimoir EUGENE nozELLE, 9F CA'MBERSBUBG, `PiiiNNs'izi.vii

NIIA,

GMNDINGMILL-- Application filed April- 3, 1909, Serial No.^4.87,71l1y To all 'whom it may concern:

Be it known that I, MARioN E. Roz'annri, al

citizen of the United States, residing at- Chambersburg, in the count-y of FranklinA certain new and useful Improvements in Grinding-Mills and I do hereby declare the following to be a full, clear, and' exact de'- able others skilled in the art tov-which it appertains to make and use the same.

This invention relates to grinding mills' and more especially to mills of this kind intended foruse in'roller flour mills, thel improved mill being particularly adapted for grinding pure middlings, line 'flat middlings, flat tailings and low. grade stock.

The invention aims to provide a grinding mill in which the grinding roll and the cylinder inwhich it is arrangedcoact With. each other in an improved manner in order to produce a rapid and thorough grinding,

'of the stock, and to furnisha construction in which the grinding ring 4has an improvedl arrangement with respect to the cylinder and roll. This grinding ring normally surrounds a-nd bears against the ,discharge` end of the roll, and the material, after being gro-und by flutes on the roll and cylinder, is still more finely divided by passing between the grinding ring and the portion of the roll against which it bears. Improved means are also provided for adjusting the i'inding ring in order to' move it into more or less close contact with the coacting surface of the roll, vand such means preferably embody a single manually operated mecha-- nism operable from the exterior of the casin y (lnother important feature of the invention is that the grinding ring is automatically moved out of coperation with the grinding roll when an excessive amount -of material en'ters the mill and overloads or chokes the latter. To this end the grinding ring is yieldingly held against the discharge end of the grinding roll, and when an excess of material passes between the` grinding roll and cylinder the ring will be moved axially away from the roll and toward the discharge end of the mill, thus reilieving the machine.

A still further object in view is to provide a mill of this kind inrwhich one of the shaft-A bearings is adjustable so vthat if the grind ing ring lwhen adjustedI axially Ito the de- .the mill, and Fig. 3 is a vertical transverse 'Specification of Letters Iratent. Paten'tedJ 30,1912.

Renewed December 15, 1911'. Serial No. 666,039.

','siredj` extent with respect to thev grinding roll' is out of centeriwith respect to said roll,

centering' can be effected by adjusting the A shaft-bearing to the proper position. and State of Pennsylvania, have invented Q vinding mill constructed in accordance With th uilellti011, Fg. 2 is an elevation, scription of the invention, suchl as will en partly in section, of the discharge end of section on line 3 3 of Fig. 1.

The casing 'A of the mill is preferably formed inthree sections; an intermediate supporting section 4, which carries the grind-ing cylinder; an'end Asection 5, provided With a feedspout 6 and a shaft bearing 7: and an end section 8 provided'with a discharge opening 9 and al shaft bearing 10. The `grinding roll B is mounted upon av shaft 11 journaledin the bearings 7, 10,

and said roll carries at its receiving end a `Afeed-worm 12 which receives the material In the .accompanying drawingz-Figure'l is .a vertical longitudinal section through a' fed through the spout or hopper 6. and

forces lit longitudinally of the machine between the cooperating grinding surfaces of the grinding. roll and cylinder, such` material after passing beyond the grinding roll then being discharged from the mill through the opening 9.

The grinding cylinder, Which is formed by a portion of t-lie intermediate' section4,

is substantially frusto-conical in form. Said cylinder,2 denoted in the drawing by referencecharacter 4, extends at one end in substantially horizontal direction beyond an uprightilange 4b of the section 4, and this end'portion, denoted by reference-character 4c, isl surrounded byan annular space 4d, as shown in Fig. 1.

Throughout the length of its grinding surface the cylinder 4a is provided with a series of flutes or corr'ugations 13, as shown in Figs. 1 and 3. Although these flutes or corrugations are illustrated as spirally arranged, theyv maybe straight in certain cases, and the semi-circular form of the flutes, as illustrated, may also be departed from lin certain cases. These flutes coact with similarly arranged flutes 14 on the frusto-conical portionBx of the grinding roll, which portion fits Within the cylinder 4at v with a certain amount of clearance, as shown in Fig. 3. The flutes 14 on the grindF ing roll are of substantially the same form as the flutes 13, and are adapted to be placed in alinenient therewith by the .rotation of o'f a Worm 21 located within within the annular space 4d,

said roll. The flutes 14 do not extend completely to the discharge end of the grinding roll but merge into a smooth tapered portion 15 formed integral with the roll.

Coacting with the smooth end portion 15 of the having a hard grinding surface of tapering form afforded in part by a tapering shoulder 17 entering the space between the end of the grinding cylinder and the smooth portion of the roll and coacting with a seat or groove 18 of annular form cut in the inner surface of the portion 4 of the grinding cylinder. The ring 16 is mounted on a worm gear 19 threaded on the portion 4c of the cylinder as shown at 20, so that when said worin gear is rotated it will be moved laterally along the cylinderand axially of the grinding roll. This movement of the worm gear is effected by means tion 8 transversely of the latter and operated by means of a hand Wheel 22. The connection between the grinding ring 16 and worm gear 19 is a yielding one so that the grinding ring may yield longitudinally o't the machine and be forced out of the angle between the cylinder and grinding roll by an excess of material. In the embodiment shown, said connection comprises screw bolts 23 passing freely through openings in the grinding ring and threaded into the worm gear 19, as shown in Fig. 1, and interposed between the grinding ring and the heads of said screw directions, may be adjusted to bolts are helical springs 24.

- The bearing 10 of the shaft 11 is carried by a casting 25 having an end'plate 26 by which it is bolted to the casing section 8 by .means of screw bolts 27. The openings 28 in the end plate 26 through which the screw bolts pass are ot somewhat greater diameter than the screw bolts, so that adjustment of the casting 25 in any direction with respect to the easing may take place. In this way the shaft, which passes through the end opening of the casing with clearance in all center the' grinding roll in the grinding ring.

In the operation of the machine the material which is fed between the grinding roll and cylinder is subjected to a very thorough comminuting action by the coperating iiutes 13, 14, which move alternately into and out of alinement with each other. The material then passes between the smooth surface 15 of the grinding roll and the grinding ring and in this manner it is ground to a still greater degree of fineness, it then passing into the discharge section of the casing and out of the discharge opening. Although the tapered end portion of the grinding roll and the inner surface of the grinding ring are smooth in the embodiment illustrated, the tapered end portion of the grinding roll may be provided with corgrinding roll is a grinding ring 16 the casing sec- -to tighten the screw bolt. 27

rugations differing from the. iiutes on the main portion of the roll, and the grinding ring may be provided with silnilar corrugations; or the grinding ring may be corrugated and the tapered part of the roll smooth, as called for by the kind of stock to be operated upon.

The adjustment of the grinding ring 16 with respect to the grinding roll, in order to make the contact more or less close, is caused by the movement of the worm gear on its threads, the hand wheel 22 being turned in a proper direction for this purpose. Should the machine receive an excess of material, the same will force the grinding ring away from the grinding roll as hereinbefore indicated, the grinding ring being guided in this movement by means of the screw bolts 23. When the charge is again reduced to normal the springs 24 will force i the grinding ring back into its initialV or normal position, this position being regulated by the adjustment of the worm gear, as will...

be understood. When the grinding ring has been adjusted with respect to the rinding roll it may be found that the latter 1s out of center with respect to the ring due to wear. of the shaft in its bearings. If this is the case the bolts 27 are loosened andthe bearing casting 25 may then be placed in such position with respect to the casing that the grinding roll will be properly centered. When this has been done it is only necessaryagain.

The ingress of the middlings or other material into the bearing casting 25 is prevented by means 'of a felt washer 29, surrounding the shaft and interposed between the casing section 8 and the end plate 26 of said bearing casting.

The springs 24 which urge the grinding ring toward the grinding roll may he ad justed in order to alter their tension. as required. This is done by means oi their retaining nuts 24x on the screw bolts 23, said nuts adjustably holding in position the washers 24y against which the ends of the springs are seated.

What I claim is 1. In a grinding mill, the combination of a grinding cylinder, a truste-conical grinding roll rotatable therein and having at its smaller end a smooth and tapered portion integral therewith, and a tapered grinding ring coacting with said tapered portion of the roll and adjustable longitudinally of the latter.

2. In a grinding mill, the combination of a grinding cylinder, a grinding roll -rotatable therein, a grindmg ring surrounding the discharge end only of said roll, and a single manually operated mechanism to move said ring longitudinally of the roll.

- 3. In a grinding mill, a grinding cylinder, a :truste-conical grinding roll rotatable v 50 latter, and means therein and having at its smaller end VaV smooth and tapered ortion integral therewith, a tapered grin ing ring coacting with said tapered portion of the roll, and a geared connection to adjust said ring longitudinally of the roll. f y

4. In a grinding mill, the combination of a grinding cylinder, a grinding roll, and a grinding ring having a threaded connection with the cylinder to move thering axially and angularly with respect to the roll.

5. In a grinding mill, the `coiribination of" a grinding cylinder, a grinding roll, a mem'- berthreaded on the cylinder wall to move lengthwise thereof, rand a grinding ring carried by said member.

6. In a grinding mill, lthe combination with a grinding cylinder, of a worm gearthreaded thereon to move of, a grinding ring carried by said gear,'and means to operate said gear.

7 In a grinding mill, the combination of a casing which forms a portion of the grinding cylinder, an extension within 'the casing and which forms the end portion of the grinding cylinder', a worm gear threaded on said extension within the casing, a grindring ring carried by said gear, and means to operate said gear from the exterior of the casing.

8. In a grinding mill, the combination of' a casing,.a grinding roll rotatable therein, a grinding ring surrounding the end of said rinding roll, a. member movable longitudi- 35. nally within the casing by. means of a threaded connection and supporting said grinding ring, and means to rotate said member from the exterior of the casing.

9. In a grinding mill, the combination 40 with a grinding roll, of a grinding ring surrounding the roll, and means to hold said ring yieldingly in contact with said roll and to permit the former to move axially yout of such contact in the direction of the discharge end of the i'nill.F

10. In a grinding mill, the combination of a ygrinding cylinder, a grinding roll rotatable therein, a grinding ring coacting with the grinding roll at the discharge end of the to mount said ring so that it is axially movable away from the end of said roll and toward the discharge end of the mill by an excess of material.

11. In a grinding mill, the combinationV l of a grinding cylinder, a grinding roll rota# lengthwise .therea casing in which table'therein, a 'grinding ring-surrounding the-discharge end means z to yieldingly hold said ring vagainst theI grinding roll the-jlatter and said cylinder, said means permittin the displacement of the' ring axially om the roll and toward the discharge the mill by an .excess Vof material between the roll and cylinder.

12.1.' n a grinding mill, the combination of a" grinding cylinder, a grinding rollirota table therein, a ,worm gear threadedon the` vcylinder tof-*move lengthwise thereof, -means to operate said gear, screw bolts carried by said. gear, .a grinding ring guided on said screwv bolts, and springs on said bolts normally holding the grinding ring in 'contact .with the grinding roll.

13. In a grinding mill, the combination of a shaft, a grinding roll carried thereby,

ing an opening at one end through which the shaft passes with clearance in all directions, a grinding ring carried by said casing and coacting with i bearing for the shaft comprising a casting having an end plate, and bolts passing with clearance through openings in said end plate and into the casin at points located around the end opening t erein.

14. In a grinding mill, the combination of agrinding cylinder, a grinding roll, a grinding ring surrounding the grinding rollat one end, a `worm gear threaded on the cylinder to move lengthwise thereof, a yielding connection between said worm gear an said grinding ring, and means to rotate said worin gear.

and in the space .between said roll rotates and havsaid roll, an adjustable only of said roll, and

l5/In a grinding mill, the combination of a casing, a grinding roll rotatable there-4 n a member within the casing and having in a threaded connection therewith' by which lsaid member is moved longitudinally of the casing, means to operate said member` lfr om the exterior of the casing, land a grinding ring yieldingly supported on said member andr coacting with one end of the grinding roll. -A

In testimony whereof I aiiix my signature, in presence of. two witnesses. A y

MARION EUGENE ROZELIIJE.

Vi'itnesses:l E. O. SMILEY I B. B. Henman.l 

